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Ilmi Himiya dar nimai duyumi asri XIX — avvali asri XX

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Dar in davra khimiya ham ba pesh qadami buzurg guzosht. Soli 1869 olimi rus D. I. Mendeleev sistemai davrii unsurhoi khimiyavii khudro joy kard. On vaqt dar jadvali Mendeleev hamagi 63 unsur mavjud bud, vale u khosiyati unsurhoi khimiyaviero, ki hanuz khudi onho malum nabudand, peshaki muayyan karda, dar jadval joi onhoro kholi mond.

Dar solhoi 70-90-umi asri XIX mukhaqqikoii khimiya unsurhoi navi khimiyaro kashf kardand. Faronsavi Lekok Buabodran galliyro, shved L. F. Nilson skandiyro, nemis K. Vinkler germaniyro, anglis U. Ramzay dar tarkibi havo argonro kashf kard. U. Ramzay soli 1898 bo hamrohii J. Rzley unsurhoi khimiyavii kripton, ksenon va neonro kashf kardand.

Dar in davra sohahoi navi khimiya ba vujud omadand. Aloqai baynihamdigarii khimiya va fizika imkoniyat dod, ki fizikai khimiyavi ba vujud oyad. Hisobi protsesshoi khimiyavi in ilmro ba riyozi beshtar aloqamand kunond. Elektrokhimiya niz yake az sohahoi khimiya gardid. Omuzishi khosiyati fizikii kristallho baroi ba vujud omadani stereokhimiya sababgor shud.

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